Free s-Block and p-Block Elements MCQs with Answers
1,359 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 questions · page 51 of 68
- A. BaO...Basic oxide
- B. Ga2O3.....Amphoteric oxide
- C. N205...Basic oxide
- D. BeH2...Intermediate hydride
Explanation: N2O5 is an acidic oxide, not a basic oxide. An acidic oxide reacts with water to form an acid.
Correct answer: N205...Basic oxide- A. Na2O
- B. MgO
- C. Al2O3
- D. SO3
Explanation: Option A is correct because sodium oxide (Na2O) dissociates in water to form hydroxide ions, making the solution strongly basic.
Correct answer: Na2O- A. 2
- B. 3
- C. 4
- D. 5
Explanation: Option A is correct because beryllium is located in period 2 of the periodic table.
Correct answer: 2- A. Aluminium
- B. Diamond
- C. Graphite
- D. Silicon
Explanation: Silicon is the correct answer as it is a semiconductor with properties that allow it to be used in electronic devices.
Correct answer: Silicon1005. Diamond is hard because
- A. It has a high value of refractive index
- B. All the valence electrons of each carbon atom are involved in bonding
- C. It is a giant covalent structure
- D. It is a crystalline allotrope of carbon
Explanation: Diamond is a form of carbon with a giant covalent structure, where each carbon atom forms four strong covalent bonds, creating a rigid…
Correct answer: It is a giant covalent structure- A. CO₂
- B. NO
- C. N₂
- D. CO
Explanation: The correct answer is Option D: CO. Carbon monoxide (CO) is a flammable gas that, when burned in oxygen, produces a blue flame due to its…
Correct answer: CO- A. 4
- B. 2
- C. 1
- D. 6
Explanation: In the network structure of silica (SiO₂), each silicon atom is covalently bonded to four oxygen atoms in a tetrahedral arrangement…
Correct answer: 4- A. Li and Be
- B. Mg and Ca
- C. Na and K
- D. C and Si
Explanation: The correct answer is Option D: C and Si. Both carbon and silicon are non-metals that form acidic oxides.
Correct answer: C and Si- A. Trigonal
- B. Cubic
- C. Linear
- D. Tetrahedral
Explanation: The correct geometry around each Si-atom in SiO₂ is tetrahedral. This is because silicon typically forms four covalent bonds, and in SiO₂…
Correct answer: Tetrahedral- A. SiO₄⁴⁻
- B. SiO₃²⁻
- C. SiO₂
- D. SiO₄
Explanation: The correct answer isSiO₂because quartz, opal, and sand predominantly consist of silicon dioxide, which has the empirical formula SiO₂.
Correct answer: SiO₂- A. -R
- B. -OH
- C. HCO3⁻
- D. O₂
Explanation: Silicones are polymeric compounds in which silicon atoms are bonded to organic groups, typically alkyl or aryl groups, denoted as -R.
Correct answer: -R- A. SiO₂ + H₂
- B. Si(OH)₄ + H₂
- C. SiO₂ + SiH₄
- D. SiH₄ + O₂
Explanation: When silicon is exposed to steam at red-hot temperatures, it forms silicon dioxide (SiO₂) and releases hydrogen gas (H₂) as a byproduct.
Correct answer: SiO₂ + H₂- A. Si(OH)₄
- B. Al(OH)₃
- C. Mg(OH)₂
- D. Ca(OH)₂
Explanation: The correct answer is Si(OH)₄. Silicon hydroxide behaves as an acid due to its structure that allows it to release protons.
Correct answer: Si(OH)₄- A. Carbon
- B. Silicon
- C. Tin
- D. Lead
Explanation: The correct answer is Carbon. Carbon tetrachloride (CCl4) is known for its lack of reactivity with water because it is non-polar and lacks…
Correct answer: Carbon- A. PbCl₄
- B. CCl₄
- C. SiCl₄
- D. GeCl₄
Explanation: Among the options provided, SiCl₄ reacts most violently with cold water.
Correct answer: SiCl₄- A. Carbon is non-metal while silicon is semi-metal
- B. CO₂ is an independent molecule while SiO₂ has a network covalent structure
- C. Carbon forms acidic oxide but silicon forms basic oxide
- D. CO₂ and SiO₂ have the same hybridization
Explanation: The correct answer is Option B. CO₂ is a linear molecule composed of discrete units, which are held together by weak van der Waals forces…
Correct answer: CO₂ is an independent molecule while SiO₂ has a network covalent structure- A. BeO
- B. Al₂O₃
- C. CO₂
- D. CaO
Explanation: The correct answer is CO₂. It is an acidic oxide that generates carbonic acid (H₂CO₃) upon interaction with water.
Correct answer: CO₂- A. Silicates
- B. Individual form
- C. Both silicates and individual form
- D. None
Explanation: Alkali metals, due to their high reactivity, are rarely found in their pure elemental form.
Correct answer: Both silicates and individual form- A. I only
- B. II only
- C. III and IV only
- D. I, II, III and IV
Explanation: All of the statements are correct. The atomic and ionic radii increase from Li to Cs with the increasing atomic number due to the addition…
Correct answer: I, II, III and IV- A. They are known as alkaline earth metals
- B. They have two electrons in the outermost shell and occupy s sub-shell
- C. Their atomic radii increase down the group
- D. Ionization energy of Ca is higher than that of Mg
Explanation: The incorrect statement about the alkaline earth metals is that the ionization energy of calcium (Ca) is higher than that of magnesium…
Correct answer: Ionization energy of Ca is higher than that of Mg